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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c04943ea982bc4e11351fef9e3d5f3d19af5cfb82c2c5b2906df0cc8f6c0eb' 
  AND token = 'PqhZYIGY3wq8WwdvAFZ6Q4+u8qnH6fDo23J2GfzRoQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}